EP1510594B1 - Low-friction sliding member and low-friction sliding mechanism using same - Google Patents

Low-friction sliding member and low-friction sliding mechanism using same Download PDF

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EP1510594B1
EP1510594B1 EP04018735A EP04018735A EP1510594B1 EP 1510594 B1 EP1510594 B1 EP 1510594B1 EP 04018735 A EP04018735 A EP 04018735A EP 04018735 A EP04018735 A EP 04018735A EP 1510594 B1 EP1510594 B1 EP 1510594B1
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group
acid
friction
low
thin film
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English (en)
French (fr)
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EP1510594A2 (en
EP1510594A3 (en
Inventor
Jean Michel Martin
Saihei c/o Nissan Art Ltd. Kano
Makoto Kano
Yoshiteru Yasuda
Yusuke Okamoto
Yutaka Mabuchi
Takafumi Ueno
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Nissan Motor Co Ltd
Nissan ARC Ltd
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Nissan Motor Co Ltd
Nissan ARC Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0605—Carbon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/046—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material with at least one amorphous inorganic material layer, e.g. DLC, a-C:H, a-C:Me, the layer being doped or not
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/16—Sliding surface consisting mainly of graphite
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • C10M2207/0225—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/40—Low content or no content compositions
    • C10N2030/43—Sulfur free or low sulfur content compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/023—Multi-layer lubricant coatings
    • C10N2050/025—Multi-layer lubricant coatings in the form of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/14—Composite materials or sliding materials in which lubricants are integrally molded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer

Definitions

  • the present invention relates to a low-friction sliding mechanism.
  • the present invention relates to a low-friction sliding mechanism with sliding members in order to obtain excellent low-friction characteristics.
  • organomolybdenum compounds such as molybdenum dithiocarbamate (MoDTC) and molybdenum dithiophosphate (MoDTP).
  • MoDTC molybdenum dithiocarbamate
  • MoDTP molybdenum dithiophosphate
  • the DLC material does not provide a low friction coefficient in the presence of a lubricating oil, as disclosed in Japan Tribology Congress 1999. 5, Tokyo, Proceeding Page 11-12, KANO et al. Even when used in combination with the lubricating oil containing an organomolybdenum compound, the DLC material cannot provide a sufficiently low friction coefficient, as disclosed in World Tribology Congress 2001. 9, Vienna, Proceeding Page 342, KANO et al.
  • the DLC material is chemically inert, and therefore a so-called tribo-film containing MoS 2 providing a low shearing force cannot be formed at the sliding surface of the DLC material although it is formed at the sliding surface of steel.
  • DE 100 17 459 A1 discloses a sliding element which is made of a disk-shaped substrate covered by a diamond-like carbon film. Said sliding element is inserted into a friction tester having a ball holder supporting steel balls made of a high carbon chromium bearing steel (SUJ2).
  • a lubricating oil an oil bath of an engine lubricating oil (5W-30SG) is provided in order to form a lubricating film between the sliding element and the steel balls.
  • WO 92/02602 A1 and WO 93/21288 A1 are both related to lubricant compositions containing mixed friction modifiers, in particular blends of amine-amide and ester-alcohol friction modifiers for internal combustion engines.
  • said objective is solved by a low-friction sliding mechanism having the combination of features of independent claim 1.
  • the hard carbon thin film is thin films formed of a DLC (diamond-like carbon) material which is an amorphous material principally formed by carbon element, of which carbon-carbon bond includes a diamond structure (sp 3 bond) and a graphite bond (sp 2 bond).
  • DLC diamond-like carbon
  • Specific examples include a-C (amorphous carbon) formed solely of carbon, a-C:H (hydrogenated amorphous carbon) containing hydrogen, and MeC containing partially a metal element such as titanium (Ti) or molybdenum (Mo) .
  • the DLC material to be used has a smaller hydrogen content preferably, not higher than 20 atomic %, more preferably, not higher than 5 atomic %, further more preferably not higher than 1 atomic %, and further more preferably not higher than 0.5 atomic %. It is also preferable to use a-C based or type DLC material containing substantially no hydrogen.
  • ion plating process and magnetron sputtering process can be employed as a film-forming method for the above hard carbon thin film.
  • the hard carbon thin film may be formed of CNx material, COx material, CFx material, or a nano-crystallized diamond of these materials.
  • the tribo-film having a functional group such as ether linkage, oxido and hydroxyl group and any combinations of ether linkage, oxido and hydroxyl group is formed at the surface of the hard carbon thin film under friction in presence of the organic oxygen-containing compound between the hard carbon thin film and the sliding surface of the opposite member.
  • This tribo-film means a coating film formed under chemical reaction during friction, between the hard carbon thin film and the opposite member, for example, as schematically illustrated in Fig. 2 in which the tribo-film having hydroxyl groups are formed at the surface of the hard carbon thin film shown as a block during friction of the hard carbon thin film with the opposite member.
  • the tribo-film has a thickness of not more than 10 nm and is formed within a range from the sliding surface (in sliding contact the opposite member) of the sliding member to a depth of 10 nm from the sliding surface during friction between the hard carbon thin film and the opposite member, the sliding surface of the sliding member being in sliding contact with the opposite member. This can lower a friction coefficient at the sliding surface site or sliding-contact site.
  • the above tribo-film has a lower friction characteristics than that of a tribo-film which does not have having a functional group (s) such as ether, oxido and/or alcohol and any combinations of ether linkage, oxido and hydroxyl group.
  • the hard carbon thin film preferably has a surface roughness Ra of 0.1 ⁇ m or less, preferably 0.08 ⁇ m or less, in consideration of stability of sliding. A surface roughness exceeding 0.1 ⁇ m may result in formation of a local scuffing, thereby significantly increasing the frictional coefficient. Additionally, the hard carbon thin film preferably has a surface hardness in micro-Vickers hardness (under a load of 10 g), of Hv 1000 to 3500, and a film thickness of 0.3 to 2.0 ⁇ m.
  • a material (base material) constituting a part other than the hard carbon thin film, of the sliding member is not particularly restricted but can be a metal material such as a ferrous material, an aluminum-based material, a magnesium-based material or a titanium-based material.
  • a ferrous material, an aluminum-based material or a magnesium-based material is preferred as it is easily applicable to a sliding part or section of machines or apparatuses and can contribute to energy saving measures in various fields.
  • a non-metal material such as a resin, plastics, carbon or the like.
  • a material formed by applying a thin film coating of various kinds on metal or non-metal materials is useful as the material constituting the part other than the hard carbon thin film, of the sliding member.
  • the part other than the hard carbon thin film, of the sliding member may be the base material having the sliding surface at which the hard carbon thin film is formed.
  • the ferrous material is not particularly restricted and can be not only iron of high purity but also various ferrous alloys (alloys with nickel, copper, zinc, chromium, cobalt, molybdenum, lead, silicon and/or titanium, or any combination thereof).
  • Specific examples include cemented steel SCM 420 and SCr 420 according to Japanese Industrial Standard (JIS).
  • the aluminum-based material is not particularly restricted and can be not only aluminum of high purity but also various aluminum-based alloys. Specifically, a hypo-eutectic or hyper-eutectic aluminum alloy containing, for example, silicon (Si) by 4 to 20 % and copper (Cu) by 1.0 to 5.0 % is desirable. Preferred examples of the aluminum alloy include AC2A, AC8A, ADC12 and ADC14 according to JIS.
  • the material formed by applying a thin film coating of various kinds on metal materials is not particularly restricted, and can specifically be a metal material such as the ferrous material, the aluminum-based material, the magnesium-based material or the titanium-based material mentioned above with a thin film (surfacial) coating such as of TiN, CrN or the aforementioned DLC material, among which a metal material coated with the DLC material is preferable. It is further preferred that the DLC material is diamond-like carbon of a-C type and containing substantially no hydrogen.
  • the organic oxygen-containing compound or lubricating oil containing the organic oxygen-containing compound is present in a sliding surface site formed between a sliding surface of the first low-friction sliding member and the sliding surface of at least one of the second low-friction sliding member and the metal member.
  • the low-friction sliding mechanism includes the above-discussed low-friction sliding member. More specifically, the low-friction sliding mechanism has a sliding surface site constituted by the sliding surfaces of two or more of the low-friction sliding member and/or another sliding surface site constituted by the sliding surfaces of the low-friction sliding member and a metal member. It is to be noted that the organic oxygen-containing compound is present at the above sliding surface sites, serving as an ashless friction modifier. With such arrangement, the extremely thin tribo-film is formed on the sliding surfaces thereby exhibiting an excellent low shearing force.
  • a material of the above-mentioned metal member is , for example, the ferrous material, the aluminum-based material, the magnesium-based material or the titanium-based material.
  • the material may be the ferrous material, the aluminum-based material, the magnesium-based material or the titanium-based material coated with a thin film (surfacial) coating such as of TiN, CrN or the aforementioned DLC material.
  • the ferrous material is used as the material of the metal member, it is preferable that the ferrous material has a surface hardness, in Rockwell hardness in C scale (HRC), of 45 to 60. Such condition is effective as it can maintain the durability of the thin film even in a sliding condition under a high Hertz's contact pressure of about 700 MPa as in a cam follower member. If the surface hardness is less than 45 (HRC), buckling tends to occur under a high Hertz's contact pressure.
  • HRC Rockwell hardness in C scale
  • the aluminum-based material has a surface hardness or Brinell hardness H B of 80 to 130. In case that the surface hardness of the aluminum-based material is outside the aforementioned range, the aluminum-based material may become easily worn at H B less than 80.
  • the material has a surface hardness, in micro-Vickers hardness (under a load of 10 g), of Hv 1000 to 3500, and a film (DLC material) thickness of 0.3 to 2.0 ⁇ m.
  • the surface hardness and the film thickness are not within the aforementioned ranges, wear tends to occur for Hv less than 1000 or the thickness less than 0.3 ⁇ m while peeling tends to occur when Hv exceeds 3500 and/or the thickness exceeds 2.0 ⁇ m.
  • the above-mentioned sliding surface site is formed, for example, at a sliding part or member in an internal combustion engine of 4 stroke cycle or 2 stroke cycle type, such as a part in a valve driving system, a piston, a piston ring, a piston skirt section, a cylinder liner section, a connecting rod, a crank shaft, a bearing, a bearing metal, a gear, a chain, a belt, an oil pump etc., also a part in a drive transmission system (for example gears) , a sliding part in a hard disc drive (HDD) system, a surgery instrument (with, for example, glycerol), a sliding part of a micro-machine MEMS (for biological applications), and other various sliding parts subjected to a severe frictional condition and requiring a low friction.
  • a sliding part or member in an internal combustion engine of 4 stroke cycle or 2 stroke cycle type such as a part in a valve driving system, a piston, a piston ring, a piston skirt section, a
  • a preferred embodiment in a valve driving system of an internal combustion engine is a sliding surface site formed by a crown surface of a lifter or a disc-shaped shim formed by making DLC coating on a ferrous (steel) base material and a cam lobe formed of low-alloy chilled cast iron, cemented steel, refined carbon steel or a material constituted of an arbitrary combination thereof.
  • the aforementioned organic oxygen-containing compound is not particularly restricted and can be any organic compound containing oxygen in the molecule.
  • it may be an organic oxygen-containing compound constituted of carbon, hydrogen and oxygen.
  • the organic oxygen-containing compound may contain another element such as nitrogen, sulfur, halogen (fluorine, chlorine etc.), phosphorus, boron, a metal, or the like.
  • an organic oxygen-containing compound constituted of carbon, hydrogen and oxygen and containing a hydroxyl group, or a derivative thereof in which it is more preferred that two or more hydroxyl groups are contained.
  • a “derivative” used herein is not particularly restricted and can be, for example, a compound obtained by reacting an organic oxygen-containing compound constituted of carbon, hydrogen and oxygen with a nitrogen-containing compound, a phosphorus-containing compound, sulfur or a sulfur-containing compound, a boron-containing compound, a halogen element or a halogen-containing compound, a metal element, a metal-containing compound (organic or inorganic), or the like.
  • the aforementioned organic oxygen-containing compound can specifically be a compound containing a hydroxyl group, a carboxyl group, a carbonyl group, an ester bond or an ether bond (two or more kinds of such group or bond may also be contained) , preferably contains one or more kinds of group or bond selected from a hydroxyl group, a carboxyl group, a carbonyl group, and an ester bond, more preferably is an organic oxygen-containing compound containing one or more kinds of group or bond selected from a hydroxyl group, a carboxyl group and an ester group, further preferably is an organic oxygen-containing compound containing one or more kinds of group selected from a hydroxyl group and a carboxyl group, and particularly preferably an organic oxygen-containing compound containing one or more hydroxyl groups.
  • organic oxygen-containing compound examples include alcohols, carboxylic acids, ethers, esters, ketones, aldehydes, carbonates (these compounds may further contain one or more kinds of group or bond selected from a hydroxyl group, a carboxyl group, a carbonyl group, an ester bond and an ether bond), derivatives thereof and an arbitrary mixture thereof.
  • the above-mentioned alcohols are organic oxygen-containing compounds represented by the following general formula (1): R-(OH) n (1) , for example, a compound containing one or more hydroxyl groups.
  • Monoalcohols (1.1) have one hydroxyl group in the molecule, including, for example, monohydric alkyl alcohols having from 1 to 40 carbon atoms (in which the alkyl group may be linear or branched) such as methanol, ethanol, propanol (1-propanol, 2-propanol), butanol (1-butanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2-propanol), pentanol (1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 3-methyl-2-butanol, 2-methyl-2-butanol, 2,2-dimethyl-1-propanol), hexanol (1-hexanol, 2-hexanol, 3-hexanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-methyl-3-pentanol, 3-methyl-1
  • linear or branched alkyl or alkenyl alcohols having from 12 to 18 carbon atoms such as oleyl alcohol and stearyl alcohol, in that they may more effectively lower the friction between the sliding member coated with the hard carbon (DLC) thin film and the sliding surface of any other material and that they are poorly volatile and therefore may exhibit their friction-reducing effect even at high temperature conditions (for example, sliding condition in an internal combustion engine).
  • DLC hard carbon
  • Dialcohols (1.2) are concretely those having two hydroxyl groups in the molecule, including, for example, alkyl or alkenyldiols having from 2 to 40 carbon atoms (in which the alkyl or alkenyl group may be linear or branched, the double bond of the alkenyl group may be in any desired position, and the hydroxyl group may also be in any desired position) such as ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,2-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 1,
  • ethylene glycol propylene glycol, neopentyl glycol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol and 1,12-dodecanediol, in that they may more effectively lower the friction between the sliding member coated with the hard carbon thin film and the sliding surface of any other material.
  • high-molecular-weight hindered alcohols having a molecular weight of at least 300, preferably at least 400 such as 2,6-di-tert-butyl-4-(3,5-di-tert-butyl-4-hydroxybenzyl)phenyl alcohol are also preferred in that they are hardly volatile even at high temperatures (for example, under sliding condition in internal-combustion engines) and are highly resistant to heat, and they can well exhibit their friction-reducing effect and can impart excellent antioxidation stability to lubricating oil.
  • Tri- and higher polyalcohols are concretely those having three or more hydroxyl groups.
  • tri- to deca-alcohols preferably tri- to hexa-alcohols are used.
  • these components are trimethylolalkanes such as glycerin, trimethylolethane, trimethylolpropane, trimethylolbutane; as well as erythritol, pentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, adonitol, arabitol, xylitol, mannitol; and their polymers or condensates (e.g., glycerin dimers to octamers such as diglycerin, triglycerin, tetraglycerin; trimethylolpropane dimers to octa
  • Saccharides such as xylose, arabitol, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, mannose, isomaltose, trehalose and sucrose are also usable.
  • tri to hexa-alcohols such as glycerin, trimethylolalkanes (e.g., trimethylolethane, trimethylolpropane, trimethylolbutane), pentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol/glycerin condensate, adonitol, arabitol, xylitol, mannitol, and their mixtures; and even more preferred are glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan and their mixtures.
  • trimethylolalkanes e.g., trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan and their
  • polyalcohols having an oxygen content of at least 20 %, preferably at least 30 %, more preferably at least 40 %. Polyalcohols that are higher than hexa-alcohols will too much increase the viscosity of lubricating oil.
  • the above component 1.4 includes alkylene oxide adducts of alcohols selected from 1.1 to 1.3. Concretely, they are prepared by adding an alkylene oxide having from 2 to 6, preferably from 2 to 4 carbon atoms or its polymer or copolymer to the alcohol to thereby hydrocarbyletherify or hydrocarbylesterify the hydroxyl group of the alcohol.
  • the alkylene oxide having from 2 to 6 carbon atoms includes ethylene oxide, propylene oxide, 1,2-epoxybutane ( ⁇ -butylene oxide), 2,3-epoxybutane ( ⁇ -butylene oxide), 1,2-epoxy-1-methylpropane, 1,2-epoxyheptane, 1,2-epoxyhexane. Of those, preferred are ethylene oxide, propylene oxide and butylene oxide, in that they are more effective for reducing friction; and more preferred are ethylene oxide and propylene oxide.
  • the mode of oxyalkylene polymerization is not specifically defined, and the groups may be random-copolymerized or block-copolymerized.
  • an alkylene oxide is added to a polyalcohol having from 2 to 6 hydroxyl groups, it may be added to all the hydroxyl groups of the polyalcohol or may be added to a part of the hydroxyl groups thereof.
  • carboxylic acids are compounds represented by the following general formula (2): R-(COOH) n (2) , for example, a compound containing one or more carboxyl groups.
  • Aliphatic monocarboxylic acids are concretely those having one carboxyl group in the molecule, including, for example, saturated aliphatic monocarboxylic acids having from 1 to 40 carbon atoms (in which the saturated aliphatic structure may be linear or branched) such as methanoic acid, ethanoic acid (acetic acid), propanoic acid (propionic acid), butanoic acid (butyric acid, isobutyric acid, etc.), pentanoic acid (valeric acid, isovaleric acid, pivalic acid, etc.), hexanoic acid (caproic acid, etc.), heptanoic acid, octanoic acid (caprylic acid, etc.), nonanoic acid (pelargonic acid, etc.), decanoic acid, undecanoic acid, dodecanoic acid (lauric acid, etc.), tridecanoic acid, tetradecanoic acid (myristic acid, etc.), pen
  • Aliphatic polycarboxylic acids include saturated or unsaturated aliphatic dicarboxylic acids having from 2 to 40 carbon atoms (in which the saturated aliphatic or unsaturated aliphatic structure may be linear or branched, and the unsaturated bond may be in any desired position) such as ethane-diacid (oxalic acid), propane-diacid (malonic acid, etc.), butane-diacid (succinic acid, methylmalonic acid, etc.), pentane-diacid (glutaric acid, ethylmalonic acid, etc.), hexane-diacid (adipic acid, etc.), heptane-diacid (pimelic acid, etc.), octane-diacid (suberic acid, etc.), nonane-diacid (azelaic acid, etc.), decane-diacid (sebacic acid, etc.), propene-
  • Carbon-cyclic carboxylic acids are concretely those having one or more carboxyl groups in the carbon-cyclic molecule, including, for example, naphthene ring-having, mono, di, tri or tetracarboxylic acids having from 3 to 40 carbon atoms (in which the alkyl or alkenyl group, if any therein, may be linear or branched, and the double bond, if any therein, may be in any desired position, and the number and the position of the substituents are not defined) such as cyclohexane-monocarboxylic acid, methylcyclohexane-monocarboxylic acid, ethylcyclohexane-monocarboxylic acid, propylcyclohexane-monocarboxylic acid, butylcyclohexane-monocarboxylic acid, pentylcycohexane-monocarboxylic acid, hexylcyclohexane-mon
  • Heterocyclic carboxylic acids are concretely those having one or more carboxyl groups in the molecule, including, for example, those having from 5 to 40 carbon atoms such as furanecarboxylic acid, thiophenecarboxylic acid, pyridinecarboxylic acid (nicotinic acid, isonicotinic acid, etc.).
  • ethers are compounds represented by the following general formula (3): R-(O-R') n (3) , for example, a compound containing one or more ether bonds.
  • Aliphatic monoethers are concretely saturated or unsaturated aliphatic ethers having from 1 to 40 carbon atoms (in which the saturated or unsaturated aliphatic structure may be linear or branched, and the unsaturated bond may be in any desired position) such as dimethyl ether, diethyl ether, di-n-propyl ether, diisopropyl ether, dibutyl ether, diisobutyl ether, di-n-amyl ether, diisoamyl ether, dihexyl ether, diheptyl ether, dioctyl ether, dinonyl ether, didecyl ether, diundecyl ether, didodecyl ether, ditridecyl ether, ditetradecyl ether, dipentadecyl ether, dihexadecyl ether, diheptadecyl ether,
  • aromatic ethers include, for example, anisole, phenetole, phenyl ether, benzyl ether, phenyl benzyl ether, ⁇ -naphthyl ether, ⁇ -naphthyl ether, polyphenyl ether, perfluoroether; and these may have a saturated or unsaturated group (in which the saturated or unsaturated group may be linear or branched, and the unsaturated bond may be in any desired position, and the number and the position of the substituents are not defined) .
  • these are liquid under the service condition thereof, especially at room temperature.
  • cyclic ethers are those having from 2 to 40 carbon atoms, including, for example, ethylene oxide, propylene oxide, trimethylene oxide, tetrahydrofuran, tetrahydropyran, dioxane, glycidyl ether; and these may have a saturated or unsaturated group, a carbon ring, or a saturated or unsaturated aliphatic group-having carbon ring (in which the saturated or unsaturated group may be linear or branched, and the unsaturated bond may be in any desired position, and the number and the position of the substituents are not defined).
  • esters are compounds represented by the following general formula (4): R-(COO-R') n (4) , for example, a compound containing one or more ester bonds.
  • esters are mentioned below.
  • Esters of the above 4.1 to 4.5 may be complete esters in which the hydroxyl group and the carboxyl group are all esterified, or partial esters in which the hydroxyl group or the carboxyl group partially remains as such.
  • the component of the above 4.1 is an ester of one or more selected from the above-mentioned aliphatic monocarboxylic acids (fatty acids) and one or more selected from the above-mentioned mono, di, tri or higher polyalcohols, and it includes a fatty acid ester ashless friction modifier.
  • the fatty acid ester ashless friction modifier is a fatty acid ester having a linear or branched hydrocarbon group with from 6 to 30, preferably from 8 to 24, more preferably from 10 to 20 carbon atoms, and it includes esters of fatty acids having such a hydrocarbon group and aliphatic mono alcohols or aliphatic polyalcohols.
  • the fatty acids as referred to herein are aliphatic monocarboxylic acids.
  • esters are glycerin monooleate, glycerin dioleate, sorbitan monooleate, sorbitan dioleate, and the like.
  • the fatty acid ester ashless friction modifier may be excluded.
  • the component 4.1 except the fatty acid ester ashless friction modifier includes fatty acid esters having a linear or branched hydrocarbon group with from 1 to 5 or from 31 to 40 carbon atoms.
  • fatty acid esters having a linear or branched hydrocarbon group with from 1 to 5 or from 31 to 40 carbon atoms.
  • those having a kinematic viscosity at 100°C of from 1 to 100 mm 2 /sec may be used for the base oil for lubricating oil, and are generally differentiated from the above-mentioned fatty acid ester ashless friction modifier.
  • polyol esters such as single esters or complex esters that are formed of tri or higher polyols having from 3 to 40, preferably from 4 to 18, more preferably from 4 to 12 carbon atoms, especially tri or higher polyols having a neopentyl structure, and one or more selected from monocarboxylic acids having from 1 to 40, preferably from 4 to 18, more preferably from 6 to 12 carbon atoms, and their mixtures, as well as their adducts with alkylene oxides added thereto, for example, trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate.
  • esters may be complete esters in which the hydroxyl group and the carboxyl group are all esterified, or partial esters in which the hydroxyl group or the carboxyl group partly remains as such. However, they are preferably complete esters.
  • the hydroxyl value of the esters is generally at most 100 mg KOH/g, preferably at most 50 mg KOH/g, more preferably at most 10 mg KOH/g.
  • the kinematic viscosity at 100°C of the base oil for lubricating oil is from 2 to 60 mm 2 /sec, more preferably from 3 to 50 mm 2 /sec.
  • the component 4.2 is an ester of one or more selected from the above-mentioned aliphatic polycarboxylic acids and one or more selected from the above-mentioned mono, di, tri or higher polyalcohols.
  • Its preferred examples are diesters of one or more polycarboxylic acid selected from dicarboxylic acids having from 2 to 40, preferably from 4 to 18, more preferably from 6 to 12 carbon atoms, and one or more selected from monoalcohols having from 4 to 40, preferably from 4 to 18, more preferably from 6 to 14, such as dibutyl maleate, ditridecyl glutamate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, and copolymers of these diesters (e.g., dibutyl maleate) and poly- ⁇ -olefins having from 4 to 16 carbon atoms
  • the component 4.3 is an ester of one or more selected from the above-mentioned carbon-cyclic carboxylic acids, and one or more selected from the above-mentioned mono, di, tri or higher polyalcohols. Its preferred examples are aromatic carboxylic acid ester such as phthalic acid ester, trimellitic acid ester, pyromellitic acid ester, salicylic acid ester. Of the esters, those having a kinematic viscosity at 100°C of from 1 to 100 mm 2 /sec may be used for the base oil for lubricating oil.
  • the component 4.4 is an ester of one or more selected from the above-mentioned heterocyclic carboxylic acids, and one or more selected from the above-mentioned mono, di, tri or higher polyalcohols.
  • esters those having a kinematic viscosity at 100°C of from 1 to 100 mm 2 /sec may be used for the base oil for lubricating oil.
  • the component 4.5 includes esters prepared by adding an alkylene oxide to one or more selected from the above-mentioned mono, di, tri or higher polyalcohols followed by esterifying them; and adducts prepared by adding an alkylene oxide to the esters selected from the above-mentioned components 4.1 to 4.4.
  • esters prepared by adding an alkylene oxide to one or more selected from the above-mentioned mono, di, tri or higher polyalcohols followed by esterifying them; and adducts prepared by adding an alkylene oxide to the esters selected from the above-mentioned components 4.1 to 4.4.
  • those having a kinematic viscosity at 100°C of from 1 to 100 mm 2 /sec may be used for the base oil for lubricating oil.
  • ketones are compounds represented by the following general formula (5): R-(CO-R') n (5) , for example, a compound containing one or more carbonyl bonds.
  • ketones include:
  • the saturated or unsaturated aliphatic ketone (5.1) can specifically be a saturated or unsaturated aliphatic ketone with 1 to 40 carbon atoms (which may be linear or ramified or branched and may have an unsaturated bond in an arbitrary position) , such as acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl butyl ketone, methyl isobutyl ketone, pinacolone, diethyl ketone, butyrone, diisopropyl ketone, methyl vinyl ketone, mesityl oxide or methyl heptenone.
  • acetone methyl ethyl ketone
  • methyl propyl ketone methyl isopropyl ketone
  • methyl butyl ketone methyl isobutyl ketone
  • pinacolone diethyl ketone
  • butyrone diisoprop
  • the carbon-ring ketone (5.2) can specifically be a carbon-ring ketone with 1 to 40 carbon atoms such as cyclobutanone, cyclopentanone, cyclohexanone, acetophenone, propiophenone, butyrophenone, valerophenone, benzophenone, dibenzylketone or 2-acetonaphthone, which may have a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution).
  • heterocyclic ketone (5.3) can specifically be a carbocyclic ketone with 1 to 40 carbon atoms such as acetothienone or 2-acetofuron, which may have a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution).
  • ketone alcohol (ketol) can specifically be a ketone alcohol with 1 to 40 carbon atoms such as acetol, acetoin, acetoethyl alcohol, diacetone alcohol, phenacyl alcohol or benzoin, which may have a carbon ring or a hetero ring (heterocycle) or may have a carbon ring or a hetero ring having a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution) .
  • acetol acetoin
  • acetoethyl alcohol diacetone alcohol
  • phenacyl alcohol or benzoin which may have a carbon ring or a hetero ring (heterocycle) or may have a carbon ring or a hetero ring having a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position
  • the ketone acid (5.5) can specifically be a ketone acid with 1 to 40 carbon atoms for example an ⁇ -ketone acid such as piruvic acid, benzoylformic acid, or phenylpiruvic acid, a ⁇ -ketone acid such as acetoacetic acid, propionylacetic acid or benzoylacetic acid, or a ⁇ -ketone acid such as levulinic acid or ⁇ -benzoylpropionic acid.
  • an ⁇ -ketone acid such as piruvic acid, benzoylformic acid, or phenylpiruvic acid
  • a ⁇ -ketone acid such as acetoacetic acid, propionylacetic acid or benzoylacetic acid
  • a ⁇ -ketone acid such as levulinic acid or ⁇ -benzoylpropionic acid.
  • the aldehydes are organic oxygen-containing compounds represented by the following general formula (6): R(CHO) n (6) ,for example, a compound having one or two aldehyde groups.
  • aldehydes include:
  • the saturated or unsaturated aliphatic aldehyde (6.1) can specifically be a saturated or unsaturated aliphatic aldehyde with 1 to 40 carbon atoms (such saturated or unsaturated aliphatic structure may be linear or ramified with an arbitrary position in an unsaturated bond) such as formaldehyde, acetaldehyde, propionaldehyde, butyl aldehyde, isobutyl aldehyde, valeric aldehyde, isovaleric aldehyde, pivalic aldehyde, caproic aldehyde, heptonic aldehyde, capryl aldehyde, peralgonic aldehyde, capric aldehyde, undecyl aldehyde, lauric aldehyde, tridecyl aldehyde, myristic aldehyde, pentadecyl aldehyde, palmitic aldehyde, mar
  • the carbon-ring aldehyde (6.2) can specifically be a carbon-ring aldehyde with 1 to 40 carbon atoms such as benzaldehyde, o-toluic aldehyde, m-toluic aldehyde, p-toluic aldehyde, salicyl aldehyde, cinnamic aldehyde, ⁇ -naphthoic aldehyde, or ⁇ -naphthoic aldehyde, which may have a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution).
  • the heterocyclic aldehyde (6.3) can specifically be a heterocyclic aldehyde with 1 to 40 carbon atoms such as furfural, which may have a saturated or unsaturated aliphatic group (that may be linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution).
  • the carbonates are organic oxygen-containing compounds represented by the following general formula (7): R-(O-COO-R') n (7) ,for example, a compound having one or two carbonate bonds.
  • the carbonates can specifically be a carbonate with 1 to 40 carbon atoms having a saturated or unsaturated aliphatic group, a carbon-ring group, a carbon-ring group having a saturated or unsaturated aliphatic group, or a saturated or unsaturated aliphatic group having a carbon-ring group (such saturated or unsaturated aliphatic group being linear or ramified, arbitrary in the position of an unsaturated bond and also arbitrary in the position and number of substitution) , such as dimethyl carbonate, diethyl carbonate, di-n-propyl carbonate, diisopropyl carbonate, di-n-butyl carbonate, diisobutyl carbonate, di-tert-butyl carbonate, dipentyl carbonate, dihexyl carbonate, diheptyl carbonate, dioctyl carbonate, dinonyl carbonate, didecyl carbonate, diundecyl carbonate, didodecyl carbonate, ditride
  • derivatives of the aforementioned organic oxygen-containing compounds are for example a compound obtained by reacting the aforementioned organic oxygen-containing compound with a nitrogen-containing compound, a phosphorus-containing compound, sulfur or a sulfur-containing compound, a boron-containing compound, a halogen element or a halogen-containing compound, a metal element or a metal-containing compound (organic or inorganic), but is not limited to such examples.
  • the aforementioned compound used for obtaining the derivative is usually employed as an additive, but its effect is not particularly restricted when employed in a base oil.
  • R and R' in the general formula (1) - (7) each independently represents a hydrocarbon group such as an alkyl group, an alkenyl group, an alkylene group, a cycloalkyl group, an alkylcycloalkyl group, an aryl group, an alkylaryl group, or an arylalkyl group (such hydrocarbon group may further contain one or more kinds of group or bond selected from a hydroxyl group, a carboxyl group, a carbonyl group, an ester bond and an ether bond, and may further contain an element other than carbon, hydrogen and oxygen, such as nitrogen or sulfur (for example a heterocyclic compound) , a halogen (such as fluorine or chlorine) , phosphorus, boron or a metal).
  • a hydrocarbon group such as an alkyl group, an alkenyl group, an alkylene group, a cycloalkyl group, an alkylcycloalkyl group, an aryl group, an alkylaryl group
  • the hydrocarbon group is not particularly restricted in the number of carbon atoms, but preferably has 1 to 40 carbon atoms, more preferably 2 to 30 carbon atoms and particularly preferably 3 to 20 carbon atoms.
  • hydrocarbon group further contains hydroxyl group and/or carboxyl group as mentioned above, the content of hydroxyl group and/or carboxyl group is not particularly limited, but is preferably 10 to 1000 ppm based on the total amount of the composition (for example, lubricating oil).
  • alkyl group examples include an alkyl group with 1 to 40 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a linear or ramified pentyl group, a linear or ramified hexyl group, a linear or ramified heptyl group, a linear or ramified octyl group, a linear or ramified nonyl group, a linear or ramified decyl group, a linear or ramified undecyl group, a linear or ramified dodecyl group, a linear or ramified tridecyl group, a linear or ramified tetradecyl group, a linear or ramified pentadecyl group, a linear or ramified hex
  • alkenyl group examples include an alkenyl group with 2 to 40 carbon atoms such as a vinyl group, a linear or ramified propenyl group, a linear or ramified butenyl group, a linear or ramified pentenyl group, a linear or ramified hexenyl group, a linear or ramified heptenyl group, a linear or ramified octenyl group, a linear or ramified nonenyl group, a linear or ramified decenyl group, a linear or ramified undecenyl group, a linear or ramified dodecenyl group, a linear or ramified tridecenyl group, a linear or ramified tetradecenyl group, a linear or ramified pentadecenyl group, a linear or ramified hexadecenyl group, a linear or ramified heptadecenyl group,
  • cycloalkyl group examples include a cycloalkyl group with 3 to 40 carbon atoms such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group or a cyclooctyl group, preferably a cycloalkyl group with 3 to 20 carbon atoms and particularly preferably a cycloalkyl group with 5 to 8 carbon atoms.
  • alkylcycloalkyl group examples include an alkylcycloalkyl group with 4 to 40 carbon atoms such as a methylcyclopentyl group, a dimethylcyclopentyl group (including all structural isomers), a methylethylcyclopentyl group (including all structural isomers), a diethylcyclopentyl group (including all structural isomers), a methyl cyclohexyl group, a dimethylcyclohexyl group (including all structural isomers), a methylethylcyclohexyl group (including all structural isomers), a diethylcyclohexyl group (including all structural isomers), a methylcycloheptyl group, a dimethylcycloheptyl group (including all structural isomers), a methylethylcycloheptyl group (including all structural isomers), or a diethylcycloheptyl group (including all structural isomers
  • aryl group examples include an aryl group with 6 to 20 carbon atoms such as a phenyl group or a naphthyl group, preferably an aryl group with 6 to 10 carbon atoms.
  • alkylaryl group examples include an alkylaryl group with 7 to 40 carbon atoms for example a mono-substituted phenyl group such as a tolyl group (including all structural isomers) , an ethylphenyl group (including all structural isomers), a linear or ramified propylphenyl group (including all structural isomers), a linear or ramified butylphenyl group (including all structural isomers), a linear or ramified pentylphenyl group (including all structural isomers), a linear or ramified hexylphenyl group (including all structural isomers), a linear or ramified heptylphenyl group (including all structural isomers), a linear or ramified octylphenyl group (including all structural isomers), a linear or ramified nonylphenyl group (including all structural isomers), a linear or ramified decylphenyl group (including all
  • arylalkyl group examples include an arylalkyl group with 7 to 40 carbon atoms such as a benzyl group, a phenylethyl group, a phenylpropyl group (including isomers of propyl group), a phenylbutyl group (including isomers of butyl group), a phenylpentyl group (including isomers of pentyl group) or a phenylhexyl group (including isomers of hexyl group), preferably an arylalkyl group with 7 to 20 carbon atoms and particularly preferably an arylalkyl group with 7 to 12 carbon atoms.
  • Derivatives of the above-mentioned organic oxygen-containing organic compounds can be used like the oxygen-containing organic compounds.
  • the derivatives concretely include, for example, compounds prepared by sulfidizing one selected from the above-mentioned alcohols, carboxylic acids, esters and ethers, ketones, aldehydes and carbonates; compounds prepared by halogenating (fluorinating, chlorinating) the same one; its reaction products with acids, such as sulfuric acid, nitric acid, boric acid, phosphoric acid, or their esters or metal salts; and its reaction products with metals, metal-containing compounds or amine compounds.
  • reaction products of one or more selected from alcohols and carboxylic acids and their derivatives with amine compounds (e.g., Mannich reaction products, acylated products, amides).
  • the amine compounds as referred to herein include ammonia, monoamines, diamines, and polyamines. More concretely, their examples are ammonia; alkylamines having an alkyl group with from 1 to 30 carbon atoms (in which the alkyl group may be linear or branched) such as methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, stearylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine,
  • aliphatic amines having an alkyl or alkenyl group with from 10 to 20 carbon atoms such as decylamine, dodecylamine, tridecylamine, heptadecylamine, octadecylamine, oleylamine and stearylamine.
  • carbonamides having from 8 to 20 carbon atoms such as oleamide.
  • lubrication may also be achieved by providing such a sliding surface site with a lubricant prepared by adding a medium (such as lubricating oil) to the organic oxygen-containing compound. It will be understood that a high friction reducing effect can be obtained even by providing such a sliding surface site with an aqueous solution containing the organic oxygen-containing compound.
  • Examples of the medium are mineral oil, synthetic oil, natural oil or fat, diluting oil, grease, wax, a hydrocarbon solvent, a non-hydrocarbon organic solvent other than the hydrocarbon solvent, water ,or a mixture thereof, particularly a medium showing a liquid state, a grease state or a wax state in a sliding condition or at the normal temperature.
  • a content of the organic oxygen-containing compound in such a medium is not particularly restricted, but a lower limit value is usually 0.001 %, preferably 0.05 % and further preferably 0.1 %, and the content may exceed 3.0 %.
  • an upper limit value is 100% as described above, but is preferably 50 %, more preferably 20 %, further preferably 10 % and particularly 5 %, and an excellent low-friction characteristics can be exhibited even at an addition of a small amount such as 0.1 to 2 %.
  • a lubricating oil base oil (a base oil of the lubricating oil) .
  • Such lubricating oil base oil is not particularly limited and any ordinary base oil, either mineral oil type or synthetic type, for lubricant composition can be employed.
  • Examples of the lubricating oil base oil of mineral oil type include a product formed by subjecting a lubricant fraction, obtained by normal pressure distillation or reduced pressure distillation of crude oil, to at least one of solvent deasphalting, solvent extraction, hydrogenolysis, solvent dewaxing, hydrogenating purification and wax isomerization, particularly a base oil subjected to hydrogenolysis, hydrogenating purification or wax isomerization.
  • a mineral oil obtained by hydrogenating purification or hydrogenolysis or an isoparaffinic mineral oil obtained by isomerization of GTL (gas-to-liquid) wax by a Fischer-Tropsche process or of normal paraffin-rich wax obtained in a dewaxing step of lubricant oil.
  • Examples of the lubricating oil base oil of synthetic type include an alkylnaphthalene, an alkylbenzene, a polybutene and a hydrogenated product thereof; a poly- ⁇ -olefin such as a 1-octene oligomer, a 1-decene oligomer or a hydrogenated product thereof; the above-mentioned ester having a dynamic viscosity of 1 to 100 mm 2 /s at 100°C, described in the foregoing; and a mixture thereof.
  • Preferred examples of the lubricating oil base oil of synthetic type other than such ester include a poly- ⁇ -olefin such as a 1-octene oligomer, a 1-decene oligomer and a hydrogenated product thereof. Also as the ester, a polyol ester is particularly preferable.
  • the lubricating oil base oil of mineral oil type or the lubricating oil base oil of synthetic type either singly or as a mixture
  • a mixing ratio of two or more kinds of the base oils is not particularly restricted and can be selected arbitrarily.
  • a total aromatic content of the lubricating oil base oil is not particularly restricted, but is preferably 15 % or less, more preferably 10 % or less and further preferably 8 %.
  • a total aromatic content in the lubricating oil base oil exceeding 15 % results in an inferior stability to oxidation and is undesirable.
  • a composition of a high friction reducing effect can be obtained even with a total aromatic content in the lubricating oil base oil of 2 % or less, or even 0 %, for example in an ester lubricating oil base oil such as a highly hydrogenolyzed mineral oil, a wax isomerized mineral oil, a poly- ⁇ -olefin or a hydrogenated product, a hydrogenated product of 1-decene oligomer, polyole ester, or a mixture thereof.
  • an ester lubricating oil base oil such as a highly hydrogenolyzed mineral oil, a wax isomerized mineral oil, a poly- ⁇ -olefin or a hydrogenated product, a hydrogenated product of 1-decene oligomer, polyole ester, or a mixture thereof.
  • the content of the organic oxygen-containing compound (excluding esters as the lubricating oil base oil) exceeds 2 %, since the storage stability may be deteriorated, it is preferable, if necessary, to regulate the total aromatic content (for example at 2% or higher) of the lubricating oil base oil by blending a solvent purified mineral oil or an alkylbenzene, or to employ an ester as the lubricating oil base oil.
  • total aromatic content means a content of an aromatic fraction measured according to ASTM D2549, and such aromatic fraction ordinarily contains alkylbenzenes, alkylnaphthalenes, anthracene, phenanthrene, alkylated substances thereof, a compound in which four or more benzene rings are condensed, and compounds containing heteroaromatic structure such as pyridines, quinolines, phenols and naphthols.
  • a dynamic viscosity at 100°C is preferably 2 mm 2 /s or higher, and more preferably 3 mm 2 /s or higher. Also an upper limit is preferably 20 mm 2 /s or less, more preferably 10 mm 2 /s or less and particularly preferably 8 mm 2 /s or less.
  • a lubricating oil base oil with a dynamic viscosity at 100°C of 2 mm 2 /s or higher allows to obtain a composition capable of sufficient oil film formation, an excellent lubricating property and a smaller evaporation loss of the base oil under a high temperature condition.
  • a dynamic viscosity at 100°C of 20 mm 2 /s or less reduces a fluid resistance, thereby allowing to obtain a composition with a smaller frictional resistance in a lubricated site.
  • a viscosity index of the lubricating oil base oil is not particularly restricted but is preferably 80 or higher, and, in case of use as a lubricant composition for an internal combustion engine, it is preferably 100 or higher, more preferably 120 or higher, and may be within a range of 140 to 250.
  • a lubricating oil base oil of a high viscosity index allows to obtain a composition excellent not only in a low-temperature viscosity characteristics but also in a friction reducing effect.
  • the lubricating oil may further include an ashless dispersant, an abrasion preventing agent or extreme pressure agent, a metal-based cleaning agent, an antioxidant, a viscosity index improving agent, another friction modifier, an antirusting agent, a nonionic surfactant, an antiemulsification agent, a metal deactivator, or a defoaming agent singly or in a combination of plural kinds, for improving required performances.
  • ashless dispersant various known ashless dispersants can be employed.
  • polybutenylsuccinimide or a derivative thereof can be advantageously employed.
  • polybutenyl succinimide usable include compounds represented by the following general formulas (1) and (2).
  • n represents an integer of 1 to 5, preferably 2 to 4, so as to attain a good detergent effect.
  • PIB represents a polybutenyl group derived from polybutene.
  • the polybutene can be prepared by polymerizing high-purity isobutene or a mixture of 1-butene and isobutene in the presence of a boron fluoride catalyst or an aluminum chloride catalyst in such a manner that the polybutene attains a number-average molecular weight of 900 to 3, 500, preferably 1, 000 to 2,000. When the number-average molecular weight of the polybutene is less than 900, there is a possibility of failing to attain a sufficient detergent effect.
  • the polybutene may undesirably deteriorate in low-temperature fluidity.
  • the polybutene may be used after purified by removing trace amounts of fluorine and chlorine residues, which result from the above polybutene production catalyst, by any suitable treatment (such as adsorption process or washing process).
  • the amount of the fluorine and chlorine residues is preferably controlled to 50 ppm or less, more preferably 10 ppm or less, most preferably 1 ppm or less.
  • the polybutenyl succinimide can be prepared by reacting an chloride of the above-mentioned polybutene, or the polybutene from which fluorine and chlorine residues are removed, with maleic anhydride at 100 to 200°C to form polybutenyl succinate, and then, reacting the thus-formed polybutenyl succinate with polyamine (such as diethylene triamine, triethylene tetramine, tetraethylene pentamine or pentaethylene hexamine).
  • polyamine such as diethylene triamine, triethylene tetramine, tetraethylene pentamine or pentaethylene hexamine.
  • the polybutenyl succinimide derivative can be exemplified by boron- and acid-modified compounds obtained by reacting the polybutenyl succinimide of the formulas (1) and (2) with boron compounds or oxygen-containing organic compounds so as to neutralize or amidate the whole or part of the remaining amino and/or imide groups.
  • boron-containing polybutenyl succinimide especially boron-containing bis(polybutenyl)succinimide, is more preferably used.
  • the above boron compound can be a boric acid, a borate or a boric acid ester.
  • the boric acid include orthoboric acid, metaboric acid and paraboric acid.
  • Specific examples of the borate include: ammonium salts including ammonium borates, such as ammonium metaborate, ammonium tetraborate, ammonium pentaborate and ammonium octaborate.
  • boric acid ester examples include: esters of boric acids and alkylalcohols (preferably C 1 -C 6 alkylalcohols), such as monomethyl borate, dimethyl borate, trimethyl borate, monoethyl borate, diethyl borate, triethyl borate, monopropyl borate, dipropyl borate, tripropyl borate, monobutyl borate, dibutyl borate and tributyl borate.
  • the content ratio of nitrogen to boron (B/N) by mass in the boron-containing polybutenyl succinimide is usually 0.1 to 3, preferably 0.2 to 1.
  • the above oxygen-containing organic compound can be exemplified by: C 1 -C 30 monocarboxylic acids, such as formic acid, acetic acid, glycolic acid, propionic acid, lactic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, oleic acid, nonadecanoic acid and eicosanoic acid; C 2 -C 30 polycarboxylic acids, such as oxalic acid, phthalic acid, trimellitic acid and pyromellitic acid, and anhydrides and esters thereof; C 2 -C 6 alkylene oxides; and hydroxy(poly)oxyalkylene carbonates.
  • monocarboxylic acids such as formic acid, acetic acid
  • the amount of the polybutenyl succinimide and/or the derivative thereof added in the medium is not particularly restricted, and is preferably 0.1 to 15%, more preferably 1.0 to 12%, based on the total mass of the lubricating oil.
  • the amount of the polybutenyl succineimide and/or the derivative thereof is less than 0.1%, there arises a possibility of failing to attain a sufficient detergent effect. It becomes uneconomical when the amount of the polybutenyl succineimide and/or the derivative thereof exceeds 15%.
  • such a large amount of the polybutenyl succineimide and/or the derivative thereof tends to cause a deterioration in demulsification ability.
  • the ashless dispersant other than the above-mentioned polybutenyl succinimide and/or the derivative thereof can be exemplified by polybutenylbenzylamines and polybutenylamines each having polybutenyl groups of number-average molecular weight of 900 to 3,500, polybutenyl succinimides having polybutenyl groups of number-average molecular weight of less than 900 and derivatives thereof.
  • antioxidant and anti-wear agent known compounds may be mixed with the organic oxygen-containing compound or the medium containing the organic oxygen-containing compound.
  • a preferable example of the antioxidant and anti-wear agent is zinc dithiophosphate represented by the following general formula (3) :
  • R 4 , R 5 , R 6 and R 7 each represent C 1 -C 24 hydrocarbon groups.
  • the C 1 -C 24 hydrocarbon group is preferably a C 1 -C 24 straight-chain or branched-chain alkyl group, a C 3 -C 24 straight-chain or branched-chain alkenyl group, a C 5 -C 13 cycloalkyl or straight-chain or branched-chain alkylcycloalkyl group, a C 6 -C 18 aryl or straight-chain or branched-chain alkylaryl group, or a C 7 -C 19 arylalkyl group.
  • the above alkyl group or alkenyl group can be primary, secondary or tertiary.
  • R 4 , R 5 , R 6 and R 7 include: alkyl groups, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, heneicosyl, docosyl, tricosyl and tetracosyl; alkenyl groups, such as propenyl, isopropenyl, butenyl, butadienyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecyl
  • hydrocarbon groups include all considerable straight or branched chain structures.
  • the position of double bond of alkenyl group, the bonding position of alkyl group to cycloalkyl group and the bonding position of alkyl group to aryl group are free.
  • zinc dithiophosphate usable include zinc diisopropyldithiophosphate, zinc diisobutyldithiophosphate, zinc di-sec-butyldithiophosphate, zinc di-sec-pentyldithiophosphate, zinc di-n-hexyldithiophosphate, zinc di-sec-hexyldithiophosphate, zinc di-octyldithiophosphate, zinc di-2-ethylhexyldithiophosphate, zinc di-n-decyldithiophosphate, zinc di-n-dodecyldithiophosphate, zinc diisotridecyldithiophosphate and mixtures thereof.
  • the amount of the zinc dithiophosphate added in the lubricating oil is not particularly restricted.
  • the zinc dithiophosphate is preferably contained in an amount of 0.1% or less, more preferably in an amount of 0.06% or less, most preferably in a minimum effective amount, in terms of the phosphorus element based on the total mass of the lubricating oil in order to produce a higher friction reducing effect.
  • the amount of the zinc dithiophosphate exceeds 0.1%, there arises a possibility of inhibiting the effect of the ashless fatty acid ester friction modifier and/or the ashless aliphatic amine friction modifier, particularly at a sliding surface (plane) site between the DLC thin film and the opposite member formed of iron-based material.
  • the zinc dithiophosphate can be prepared by any known method.
  • the zinc dithiophosphate may be prepared by reacting alcohols or phenols having the above R 4 , R 5 , R 6 and R 7 hydrocarbon groups in the above-mentioned chemical formula (3) with phosphorous pentasulfide to form dithiophosphoric acid, and then, neutralizing the thus-formed dithiophosphoric acid with zinc oxide.
  • the molecular structure of zinc dithiophosphate differs according to the alcohols or phenols used as a raw material for the zinc dithiophosphate production.
  • the other anti-friction agent or extreme-pressure additive can be exemplified by disulfides, sulfurized fats and oils, olefin sulfides, phosphate esters having one to three C 2 -C 20 hydrocarbon groups, thiophosphate esters, phosphite esters, thiophosphite esters and amine salts of these esters.
  • the organic oxygen-containing compound can exhibit an extremely excellent low friction characteristics in case of being used between the sliding surfaces of the sliding members.
  • it may be mixed with other additives set forth below.
  • One of the additives is a metallic detergent which can be any metallic-detergent compound commonly used for a lubricating oil.
  • the metallic detergent usable include sulfonates, phenates and salicylates of alkali metals or alkali-earth metals; and mixtures of two or more thereof.
  • the alkali metals include sodium (Na) and potassium (K)
  • examples of the alkali-earth metals include calcium (Ca) and magnesium (Mg) .
  • sodium and calcium sulfonates, sodium and calcium phenates, and sodium and calcium salicylates are suitably used.
  • the total base number and amount of the metallic detergent can be selected in accordance with the lubricating oil performance required.
  • the total base number of the metallic detergent is usually 0 to 500 mgKOH/g, preferably 150 to 400 mgKOH/g, as measured by perchloric acid method according to ISO 3771 "Determination of base number - Perchloric acid potentiometric titration method".
  • the amount of the metallic detergent is usually 0.1 to 10% based on the total mass of the lubricating oil.
  • antioxidant which can be any antioxidant compound commonly used for a lubricating oil.
  • the antioxidant usable include: phenolic antioxidants, such as 4,4'-methylenebis(2,6-di-tert-butylphenol) and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; amino antioxidants, such as phenyl- ⁇ -naphthylamine, alkylphenyl- ⁇ -naphthylamine and alkyldiphenylamine; and mixtures of two or more thereof.
  • the amount of the antioxidant is usually 0.01 to 5% based on the total mass of the lubricating oil.
  • a further one is a viscosity index improver can be exemplified by: non-dispersion type viscosity index improvers, such as copolymers of one or two monomers selected from various methacrylic acids, and hydrides of the copolymers; and dispersion type viscosity index improvers, such as copolymers of methacrylates (including nitrogen compounds).
  • non-dispersion type viscosity index improvers such as copolymers of one or two monomers selected from various methacrylic acids, and hydrides of the copolymers
  • dispersion type viscosity index improvers such as copolymers of methacrylates (including nitrogen compounds).
  • copolymers of ethylene and ⁇ -olefins such as propylene, 1-butene and 1-pentene
  • polyisobutylenes and hydrides thereof polyisobutylenes and hydrides thereof
  • a hydrogenated copolymer of styrene and diene a copolymer of styrene and maleic anhydride and polyalkylstyrenes.
  • the molecular weight of the viscosity index improver needs to be selected in view of shear stability.
  • the number-average molecular weight of the viscosity index improver is desirably in a range of 5,000 to 1,000,000, more desirably 100,000 to 800,000, for dispersion or non-dispersion type polymethacrylates; in a range of 800 to 5,000 for polyisobutylenes and hydrides thereof; and in a range of 800 to 300, 000, more desirably 10, 000 to 200,000 for ethylene/ ⁇ -olefin copolymers and hydrides thereof.
  • the above viscosity index improving compounds can be used alone or in the form of a mixture of two or more thereof.
  • the amount of the viscosity index improver is preferably 0.1 to 40.0% based on the total mass of the lubricating oil.
  • a further one is another ashless friction modifier other than the above-mentioned ones.
  • the ashless friction modifier can be exemplified by ashless friction modifiers, such as boric acid esters, higher alcohols and aliphatic ethers, and metallic friction modifiers, such as molybdenum dithiophosphate, molybdenum dithiocarbamate and molybdenum disulfide.
  • a further one is a rust inhibitor which can be exemplified by alkylbenzene sulfonates, dinonylnaphthalene sulfonates, esters of alkenylsuccinic acids and esters of polyhydric alcohols.
  • a further one is a nonionic surfactant or deemulsifier can be exemplified by nonionic polyalkylene glycol surfactants, such as polyoxyethylene alkylethers, polyoxyethylene alkylphenyleters and polyoxyethylene alkylnaphthyleters.
  • nonionic polyalkylene glycol surfactants such as polyoxyethylene alkylethers, polyoxyethylene alkylphenyleters and polyoxyethylene alkylnaphthyleters.
  • a further one is a metal deactivator which can be exemplified by imidazoline compounds, pyrimidine derivatives, thiazole and benzotriazole.
  • a further one is an anti-foaming agent which can be exemplified by silicones, fluorosilicones and fluoroalkylethers.
  • the other friction modifier in lubricating oil (composition), the other friction modifier, the rust inhibitor or demulsifier is usually contained in an amount of 0.01 to 5% based on the total mass of the lubricating oil, and the metal deactivator is contained in an amount of 0.0005 to 1% based on the total mass of the lubricating oil.
  • Specimens of the sliding members (pin and disc) for a pin-on-disc (single body) friction evaluation test were prepared.
  • the pin-on-disc friction evaluation test was conducted by using a test apparatus whose essential part was shown in Fig. 1 , in which three pins and one disc were used for each test.
  • a heat treated SUJ2 material (according to JIS G 4805) was formed into a certain pin shape by grinding, and then the pin shape material was finished into various surface roughness (Ra 0.1 urn or less) by polishing with a lapping tape. Thus, the base material of pin was produced.
  • a disc-shaped material of a heat treated SUJ2 material or another material was subj ected to a certain age hardening process, and then a sliding surface in contact with the pin was finished into various surface roughness by polishing. Thus, the base material of disc was produced.
  • a-C (a-C type DLC) On a surface of the thus finished pin base material or disc base material, "a-C (a-C type DLC)", “DLC (a-C:H (10 atomic %) type)” or “DLC (a-C:H (20 atomic %) type)” was coated by a PVD process or a CVD process utilizing graphite as a target, thereby forming a coating (hard carbon thin film) on the surface of the base material.
  • the surface of the coating was finished into various surface roughness (Ra 0.1 ⁇ m or less) by polishing with a lapping tape:
  • the pin and the disc were subjected to measurements to obtain the thickness of the coating (indicated as "Film thickness”) , the surface hardness (Hv) and the surface roughness (Ra)as shown in Table 1.
  • a low-friction sliding mechanism for each example was prepared by combining the sliding members as shown in Table 1 and using the lubricating oil (composition). Thereafter, the pin-on-disc friction evaluation test was conducted on the low-friction sliding mechanism to determine a friction coefficient as described in the following:
  • the pins and the disc were arranged as shown in Fig. 1 in which the three pins (indicated as “Mated Pin (Rigid))" ) were pressed on the disc (indicated as "Test Piece") at a load of 50 Kgf so that the maximum Hertz's contact pressure was 700 MPa for Examples 1 to 5 and Comparative Examples 1 and 3) or 80 MPa for Examples 6 to 9 and Comparative Example 2) .
  • Each pin had a diameter of 5mm and a length of 5 mm.
  • the pins and the disc shown in Fig. 1 were dipped in the lubricating oil in an oil bath at an oil temperature of 80 °C. The disc was rotated at a rotational speed of 30 r.p.m. (0.03 m/s) for 60 minutes. Results are shown also in Table 1.
  • Example 5 the specimens of Example 5 using the DLC material having a hydrogen content of 20 atomic % was apparently degraded in friction reducing effect as compared with those of Example 4 using the DLC material having a hydrogen content of about 10 atomic % and other Examples using the DLC material of a-C type having substantially no hydrogen content.
  • the extremely thin tribo-film having certain functional group(s) is formed at the sliding surface of the sliding member when the sliding member is in sliding contact with the sliding surface of an opposite member in presence of the organic oxygen-containing compound. Accordingly, the present invention can provide the low-friction sliding member and the low-friction sliding mechanism exhibiting a low shearing force as compared with conventional sliding members and sliding mechanisms where a film containing MOS 2 is formed.

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US20050064196A1 (en) 2005-03-24
CN1598340A (zh) 2005-03-23
DE602004019606D1 (de) 2009-04-09
US7771821B2 (en) 2010-08-10
EP1510594A2 (en) 2005-03-02
EP1510594A3 (en) 2006-04-26
ES2321713T3 (es) 2009-06-10
CN101943214A (zh) 2011-01-12
JP5058331B2 (ja) 2012-10-24
CN101943214B (zh) 2012-05-30
ATE423859T1 (de) 2009-03-15
JP2011089644A (ja) 2011-05-06

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